Drilling mechanism



July 31, 1928. 1,679,139

E. G. G ARTIN l DRILLING MECHANISM 2 Sheets-Sheet 1 Filed March 24, 1924 July 31, 1928. 1,679,139

- E. G. GARTIN DRILLING IIEGHANISK Filed uarcn 24; 1924 .l l 2 sheets-smetv 2 ELMER G. GARTIN, or cnAREivioNr,

MACHINERY COMPANY, A

PATENT oFFI-cE.

NEW HAMPSHIRE, ASSIGNOR T0 SULLIVAN CORPORATION ,OF MASSACHUSETTS.

mainmise MEeHANIsivi.

Application filed March 24, 1924. Serial'No. 701,368l

This invention relates to drilling mechanisms, and more particularly to gang drills.

It has for its object to provide an improved drilling mechanism. A further object is to provide an improved gang drilling mechanism. In gang drilling mechanisms it is generally desirable to sta-rt the steels into the rock or other material being drilled at the same instant and to thereafter continue feeding all of the drills comprising the gang at a uniform rate of speed so that all holes drilled will be of a uni orm depth. In devices of this general character, as far as I am aware, if one steel is somewhat shorter than the others it will not engage the material to perform any'drilling operation until the longer drills have penetrated the. mate rial a depth substantially equal to the differ ence in length of the steels. As a result some of the holes will be deeper than others and when the slab of rock or other material is split it is obvious bility that it will be rather irregular. It is therefore a further object of my invention to provide improved feedingv means for said gang drills. Still another object is to provide improved feeding means for the individual drills of the gang whereby each drill may be moved relative to the others. Another object of my invention is to provide improved feeding means whereby the previously mentioned object may be obtained from a central point. Another object is to provide improved means wherebya pluralf ity of drills less than the total number in the gang may be fed independently of the remaining drills. A still further object of the invention is to provide improved drill supporting means whereby a standard type o-f drill and supporting mechanism, usually used in a d-rifter type of drilling mechanism, can be'supported upon a usual quarry bar. Another object is to provide such a supporting structure that-the /drill'mayy be readily detached without affecting the. operation of the feeding mechanism.

In the accompanying drawings I have shown for purposes of illustration one form` which my invention may assume in practice. y n Y In these drawings,- Fig. 1 is a front' elevation partly broken away to show details of construction..

Fig. 2 is a vertical transverse section taken substantially on line `2-2 of Fig. 1.

y 6 and adapted to y ion 8 and I have shown such that there is some possi- Fig. 3 is a transverse horizontal sectional view taken substantially on line 23e-f3V of Fig. 1. l i i I have shown my improved mechanism 1 as mounted upon a usual lhori- Zontal quarry lbar 2 which supports a split clamping member 3 longitudinally movable, but nonrotatably mounted thereon. It

is supported on'any. suitable construction such at each end thereof. The clamping member comprises a usual split member having a bore and prevented from rotation as by the key be along the bar as bya rack and pinion 7 and 8 respectively, the rack being fixed upon the upper side of the quarry bar. Any suitable means might be used for actuating the pin# means as coinprising a shaft 9 having an actuating handle l10 mounted on the outer end thereof, all of which is supported in suitable bearing means 11 carried on the upper side of the clamp 3. In orderkthat the clamp may vbe held in any desired position, a usual screw l2 maybe tightened to hold rigidly said clamp. To support a shell 11ifor carrying the several drill mechanisms to belater described, I have provided in the front face of the clamping member 8 a circular recess 15 forming one part of a swivel Aclamping joint for the shell. plurality of vertically disposed, integrally formed guiding members 16 having ya centralcylindrical portion 17 adapted to seat within the recess 15 and is clamped therein by any suitable clamping means member 18. lVhen it is desired to drill holes at an angle vto the horizontal, the clamp 18 is releasedfand the swivel joint 17 permits angular rotation of the gang drills, all of fed longitudinally gang drilling will 'i of course be understood that this quarry bar as a tripod or triangular legs disposed 5 to engage the periphery of the bar 2 This shell comprises a vsuch as a- Y which will retain the same relative relation by transverse members 19, these guidingk members having longitudinal semi-cylindrical recesses 2O terminating in longitudinal 25 having a nut 26 non-rotatably mounted 'therein and adapted to engage a usual feed screw 27 rotatably carried at its upper end in a bearing 29 mounted upon the upper end of the shell 14, said screw also being mounted at its lower end wit-hin the shell 14 as by a bearing 30. Rotatably mounted upon the lower end of each of the laterally disposed screws 27 is a helical gear 31 and also mounted upon the screw and directly abo-ve the gear is a longitudinally movable clutch member 32 splined to the screw, said gear 31 and member 32 being adapted to be connected as by usual teeth 33 on the adjan cent surfaces thereof. The clutch 32 is adapted to be thrown into and out of engagement with the gear 31as by a yoke and lever construction 35 pivotally mounted in the shell. lt will be understood that the feeding mechanism for the cradle 23 thus far described is substantially identical to the feeding construction of the remaining drilling mechanisms. The feeding mechanisms of the drills are interconnected as through the gears 31 which mesh with a worm 36 iiXed upon a rotatable shaft- 37 carried by the shell. It will of course be understood that this shaft may be disposed as shown within one of the members 19, the gears being fixed to the shaft such for instance as by keys 38 and a plug 39 disposed within the bore in which thc shaft is mounted to prevent longitudinal displacement.

The feeding mechanism of the ycentral drill is used to control the feeding of the remaining drills and to vary the relative positions with Vrespect' to each other. To accomplish this 1 have shown a. helical gear 40 mountedv upon the shaft 37 and adapted to engage a similar gear 41 which is mounted upon the lower end of the feed screw 27 of the central drill in thesame manner that the gears 31 are for the remaining drills. The central feeding shaft 27 has a detachable handle 42 mounted upon its squared upper end and it will thus be seen that with all the clutches 33, 34 in engagement rotation of the handle will rotate the gear 41 and consequently the gears 31 which will transmit rotation to the feed screw as through the spline connect-ion of the clutch and cause vertical movement of the cradle 22 due to the nut 26 being carried by said cradle. It will of course be understood that the feed shaft 27 for the worm 41 also-passes through theV feed nut 26 mounted in amanner similar to that shown in Fig. 2. As is customary in the drifter type of drill, the shell 14 has side rods 43 longitudinally mounted therein and which are adapted to be connected at their upper ends by a yoke construction 44 which also supports the outer end of the feed screws. It will herein be noted that the upper end of each of the screws 27 is squared as at 45 in such manner as to receive the detachable handle 42 for purposes hereinafter described.

The cradle 22, as previously mentioned, is of practically standard vconstruction as is also the drilling mechanism proper. This drilling mechanism comprises a usual percussive type motor 45 with any usual rotating mechanism for ay steel 46 carried within the lower vend of the motor 45 as by a chuck housing 47, the latter being adapted to be fixed in the cradle 22 as by a removable clamping member 48, herein shown as being pivoted atv 49 to a seating portion 50V in which the housing .47 rests. The seating portion 50 to which the clamp .48 is connect-- ed is longitudinally adjustable in guides on the cradle 22 to accommodate different lengths of drilling tools. The upper end of the drill is supported byV its usual handle members 51 disposed within a clamping member 53 removably held to the cradle 22 as by nut and screw connection 54. It will be noted of course that the member 50 is of somewhat greater length than apparently necessary, but such a construction permits of a larger sized drilling motor without necessitating a different shell or cradle mechanisnr VJactuating fluid can be supplied to the several motors as through inlet valve mechanism' 55, herein shown as vprojecting into the motor from the front side. It will o-f course be understood that any suitable connections may be used to allow the supply hose 56 to be led to the motor from any direction desirable. y v

ln the operation'of my device, when the place in which the'drills are to operate is determined, the'. bolt 12 of the clamping member 3 is released'and the handle 10 rotated to cause longitudinal movement of the member 3 along the quarry bar 2 as by the rack and pinion connection 7 and 3. "When the desired location is reached, the bolt 12 is tightened and in casethe drills are of a different length so that they will not all start to drill at they same time thel clutch members 33, 34, for the laterally disposed screws will be disengaged'with .the exception of the clutch for the central screw. Rotation of the handle 42 will then feed the central drill either down or up as desired until the end of its drill lies substantially in the same plane as one of the other drills, say,'the left hand one as shown in Figs. 1 and 3, after which the clutch for the left hand drill is thrown into engagement and further rot-ation of the handle 42 will thus cause uniform lll() movement up or down as desired by both drills. If it is now desired to make the ends of these drills lie in the same plane with the right hand drill, the clutch of this latter drill is still released and the other two drills brought up or lowered as required until they all lie in the same plane, after which the clutch for the right hand drill is thrown into engagement and the further rotation of handle 42 will thus uniformly feed all drills and will insure that they engage the material simultaneously and thereby drill holes of substantially the same depth. If it is.desired to feed the laterally disposed drills independently of the central drill the handle 42 may be detached from the central screw and attached to the squared upper end of one or the other of the laterally disposed screws 27, the clutch 33, 34 controlling the feed of the central drill being inoperative at that time. It will be seen thatwith my improved construction I can take drills of non-uniform length, which in practice would be the way the drills would come, and thus insure having the holes drilled of the same depth.

IVhile I have in this application specifically described one form which my invention may assume in practice, it will be understood that this form of the same is shown for purposes of illustration and that the invention may be modified and embodied in various other forms without departing from its spirit or the scope of the appended claims.

Vhat I claim as new and desire to secure by Letters Patent is:

1. A rock drilling mechanism comprising a plurality `of unitary percussive tools adap ed to use drill steels of different length, and means for positively feeding said tools toward .the work including means operative to adjust the relative position of the tools whereby the same may drill holes of uniform depth and including feeding mea-ns having an operating element commonto all of said tools.

2. A rock drilling mechanism comprising a support, a plurality of unitary percussive drills carried thereby, means whereby said drills may assume a plurality of angular posit-ions, and positive `means including a common element for feeding the drills rela.-

tive to each oth-er or for uniformly feeding said drills toward the work, said drills having no transverse movement relative to said work during the drilling operation.v

3. A rock drilling mechanism comprising a laterally and angularly adjustable support having guides thereon, a plurality of cradles mounted in lSaid guides, and means for mounting a unita-ry drill on each of said cradles, said means comprising a plurality of spaced clamping devices one of which is longitudinally adjustable relatively to another.

4. A rock drilling mechanism comprising a laterally and angularly adjustable support having guides thereon, a plurality of unitary percussive drills mounted in said guides, and means including a. common operating element for independently or simultaneously positively feeding saiddrills relatively to said support and toward the work while said support is held in fixed adjusted position.

5. A rock drilling mechanism comprising a support having guidesthereon, a plurality of unitary drills mounted in said guides, and means for positively feeding said drillsv toward and' from the work and rela-tively to said support comprising parallel feeding elements and a cooperating transverse feeding element, said feeding means being operative independently of any movement of said support. f

6. A rock drilling mechanism comprising a support having guides thereon, a cradle mounted in each of said guides and having adjustable clamping devices carried thereby adapted to receive a unitary drilling tool, Y

and means for independently or simultaneously positively feeding said cradles relative to sai-d support and toward the'wor-k, said Vsupport being stationary relative to the Work during operation of said feeding means.

p In testimony whereof I aiiiX my signature.

ELMER G. GARTIN. 

